Rotary pump



H. R. A. MALLOCK ROTARY4 PUMP Filed Feb. 6, 1922 INVENTOR: EUR. A. MALLOCK,

By his Attorneys,

solution Vthrough the'ne'orifices ofthe spintion under nozzles.

Patented Feb. i7, 1925.

1,526,356 PATENT oFFlcE.,

fnEivrY REGINALD ARNULPH MALLoloK, or EXETER, ENGLAND, AssrGNon ro AMERICAN .KCELLULOSE AND CHEMICAL f A CORPORATION or DELAWARE.

MANUFACTURING COMPANY LIMITED,

" ROTARY PUMP.

Application filed February 6, 1922. Serial No. 534,616.

To all whom it may concern.'

jBe it known that I. Huisnr 'REGINALD ARNLIH hlaLLoon, ll`. It. S., a subject of' l the King` of lreatlh-itain, of Exeter, England, have inventedcertain new and useful Improvements in Rotary-Pumps, of which the following is a specification.

This invention relates to pumps, more especially for use in spinning artificial threads from viscous solutions of cellulose' acetate, viscose, nitrocellulose, lcuprainmoniunrcellulose or other cellulose derivatives, for the purpose of supplyingI the solupressuretothc spinning jets or The invention concerns pumpsof what is knoivn as the gear type. These pumps, which are usuallyY of small dimensions and runatloiv speeds, have been employed for supplying various liquids under pressure and their use -for spinning artificial silk threads was proposed in- British specification" No. 28,320 of 1912. They comprise tivo toothedftvheels gearing into each other and mounted in a casing 1n cells which closely at itslother or outer end. The solution, `supplied tothfelpump from a reservo ir o`r otherwise, enters and 'lills the admission space; thennrneshing side of the lWheels andis"carriedround "betvveen the teeth of the v-vvheels and the casing to the delivery space at.` the Hmeshingside of ther Wheels, `from Whichitisldelivered through an outlet.

" In spinning artificial silk it is of great im lportance to'4 maintain the denier `of -the thread produced as uniform as possible, and

consequently the pumps used for forcing the ning nozzles shoulddeliver the/solution very regularly and accurately.`

In gear pumps as hitherto constructed and as employed for spinning artificial threads, the spindle that drives the .driven gear Wheel, i. e., the first toothed wheel of the pump, is eitherrigidly fixed thereto or is so j disposed in relation thereto that the axes of the spindle and of said wheel are constrained to parallelism during Working.

To `have found that very considerable irregularities in the denier of the thread produced arise in operation, on account of the diiliculty in securing accurate coincidence between lhetrue axis of the pump Wheel,

the axis of the .driving spindle, and of the' bearing which supports the driving spindle at its outer end. lAny want of accuracy in these respects causes bending stresses'in the pump which affect adversely the denier' of the thread produced. v

It has now been found that this drawback can be very greatly reduced and the pump for example after the manner of a single Hookes joint.

Any suitable means or device may be employed for the purposereferred to.v

According to one kform the driving spindle may be formed `at the end with a` ball from 'which projects radially a cylindrical stud,

the ball fitting in acentral circular hole cut in the toothed 'disc that forms the Wheel, and the cylindrical stud fitting in av radial `slot `or keyway opening out of the central circular hole.

If desired, the other or outer end of the driving spindle may be supported by means which give no directional guidance to the axis ofthe spindle and are thus equivalent to a second Hoolres joint. `Such means might consist of a simple hole iny a plate into or through which the outer end ofthe spindle' carrying the toothed or chain wheel `or the like passes, the spindle having, or

not.` a'spherical or like portion Working in ond device of Hookes joint character 'is employed, this is made so that the driving the'hole Preferably, however, when a secspindle is independent of or separable from the axis of the toothed or chain Wheel or other device that imparts the drive to the l driving spindle may be formed with aball end projecting into an elongated axialcylindrical socket or boss of the toothed or chain wheel or the like, which is mounted in a bearing or support, the ball end having a projecting cylindrical stud .engaging in a groove or slot cut. in the said socket or boss. Thus the driving spindle can be withdrawn from the socket or boss when required without dismeunting the toothed or chain wheel 'or the'like that imparts the drive to it. A coiled spring may be fit-ted inthe socket or boss to assist in keeping the driving spindle with its other end in good engagelnent with the gear wheel of the pump. Any other connection of a Hooke jointeharaeter may 0f course be employed.

The second wheel of the pumpis prefer' ably in the form of a toothed disc simply fitted accurately in its closely embracing cell in the casing and the toothed wheels ofthe pump or their circumferences are preferably ground -to the walls of their cells in the casing.

The accompanying drawings illustrate by way of example a gear wheel pump constructed and arranged in accordance with the invention inone form thereof, Fig. 1

.being a` side elevation, partly in vertical mid-section, of the pump and driving gear, and Flg. 2 a sectional view of the pump with the outer plate or cover 3 removed.

The pump comprises as usual three plates or sections 1, 2, 3 of steel or other suitable metal xed tightly together by screws 5 passed through holes G in the sections 1 and 2 and screwing into tapped holes registerl ing therewith in the cover or section 3, the middle section 2 being formed accurately with the holes that form the chambers or cells closely surrounding the gear wheels 7 8 and leaving a small inlet chamber 9 on the unmcshing side of the wheels and a discharge chamber 10 on the meshingside. 11 indicates the supply passage leading to the inlet chamber t), and 12 the delivery passage leading from the discharge chamber l0. Lugs 13 on thesection 1 provide for bolting the pump to a suitable part of the spinning metier as usual.

'As shown in Figs. 1 and 2 the second or follower wheel 8 of the pump is in the form of a toothed disc simply litt-ed in its cell.

14 is the driving spindle of the pump project-ing through a hole 15 in the cover of the pump and formed at this end with a ball 16 from which ay cylindrical stud 17 projects radially, the ball 16 fitting in a central circular hole cut in the toothed wheel 7 of the pump, and the stud 17 fitting in a radial slot or keyway 18 opening ont of. the ccntral hole of the wheel. Thus the drive can be imparted te the gear lwheel 7 while allowing the axis of the driving spindle 14 to have angular play relatively to the axis of this Wheel.

The outer end of the driving spindle 14 Y Wheel being mounted in a pillar bearing 22 mounted on the spinning metier in any suitable way. The ball end 19 has a cylindrical stud 28 engaging in a slotQ/l out in they socket or boss 20. Thus while the outer end' of the driving -spindle does-not receive directional guidance from the hollow boss 20, it

.can be withdrawn therefrom when required,

without dismounting the chain wheel 21, 25 is a coiled spring fitted in the hollow boss 20 to assist in keeping the driving spindle 14 with its other end in good engagement with the gear wheel 7 of the pump. f

What .I claim and desire to secure by Letters Patent is 1. In a pump apparatus ofthe gear type comprising intel-meshing driver and driven liquid forwarding gear wheels located in the pump casing, the combination of a driving spindle for the driver gear wheel and a pivotal driving connection between said spindle and the driver gear wheel, whereby the axis of said spindle has angular play relatively to the axis of the driver gear wheel.

2. In a'pump apparatus of the gear type lcomprising intermeshing driver and driven liquid forwarding gear wheels located in the pump casing, the combination of a driving spindle for the Adriver gear wheel, a pivotal driving connection between said spindle and the driver gear wheel, whereby the axis of said spindle has angular play relatively to the axis of the driver gear wheel, means for freely supporting the outer end of the driving spindle, said means giving no directional guidance to the spindle axis, and means for imparting rotation tol said driving spindle.

3.- ln a pump apparatus of the gear type comprising intermeshing driver and driven liquid forwarding gear wheels located in the pump casing, the combination of a driving spindle for the driver gear wheel. a pivotal driving connection between said spindle and the driver gear wheeLsaid connection com-` prising a central hole in the driver gear wheel', a radial slot opening therefrom and a ball end on said spindle fitting in said central hole and havinga stud engaging in said radial Slot.

4.111 a pump apparatus of the gear type comprising intermeshing driver and driven liquid forwarding gear wheelsl located in the, pump casing, the combination of a driving spindle for the driver gear wheel, a pivotal driving connection between said spindle and the driver gear wheel. whereby the axis of said spindle has angular play relatively to the axis of the-driver gear wheel, a wheel for imparting rotation to said driving spindle, an axialsocket on said wheel :idapted to receive the outer end of said driving spindle, a pivotal driving connection between said socket and the onteiend othe driving spindle, comprising an open ended longitudinal slot in said socket, and a stud on tlie onter end of said driving spindle and engaging in said open ended slot, whereby the louter end of the driving spindle is freely supported Without directional guidnnee of tlie spindle axis. i

5. ln a pnnip npparzitiie oi t-lie gear type comprising iiiteriiiesliing driver :ind driven liquid forwarding gear wheels located in lie pninp easing, tlie combination of a driving Spindle for tlie driver gear wheel, a ventral liole in tlie driver gear Wheel, a radial slot opening therefrom, a ball end on said spindle fitting in said central hole und having a stud engaging in said radial slot, a Wheel for imparting rotation to said i driving spindle, van axial socket on swid wlieel adapted to receive the Outer end of said driving spindle, an open ended longitudinal slot in said axial socket, a spherical portion on tlie outer end of the driving spindle engaging in said socket, a stud on said spherical portion engaging in said open ended slot, and a spring located between tlie outer end of tlie driving Spindle and tlie bottoni of the axial socket.

In testimony Whereot l lia-ve hereunto subscribed my naine.

HENRY REGINALD ARNULPH MALLOCK. 

